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Ms Young, who is originally from Sydney, Australia, said: “Upon returning to the property, we only got as far as the back door, but we went no further. I was in shock. I could see all of the branches littered all over the floor.

“It’s very frustrating. I’ve never seen anything like this in 40 years.

“I was told there were 137 plant pots in the living room, and altogether probably around 300 or 400 pots in the whole house.”

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She said: “That’s my feeling, just to clear it completely. It’s ruined the house. I guess this is the type of thing that goes on around here. There could be loads of these factories in the area.

“There are fewer and fewer students in Treforest despite the University of South Wales being here, as more and more want to move to Cardiff. There are loads of ‘for sale’ and ‘to let’ signs if you look around.

“The incident hasn’t put me off the area as such, because this is the first time I have seen anything like it, but it’s certainly put me off the house.”

Devon and Cornwall Police, who are leading on the case, said an investigation is ongoing but that no arrests or charges have been made.

The equipment was found in cupboards, under the stairs and behind doors